[CQ-Contest] band plan definition - LSB vs USB

Robert Chudek - K0RC k0rc at citlink.net
Wed Oct 3 14:41:07 EDT 2012

The US regulations require our signals to be contained within the 
designated band limits. As an example, 14.150 ~ 14.350 MHz.

A transceiver typically displays the suppressed carrier frequency. Let's 
use 14.200 MHz as an example. When you transmit on upper sideband, the 
voice signal is contained with the range of 14.200 to 14.203. If you 
change to lower sideband, the signal is contained within 14.200 to 
14.197 MHz.

 From this information you should be able to determine how close to a 
band edge your suppressed carrier frequency can be set. It depends on 
what sideband is selected and which band edge you are near. The examples 
give in the ITU R1 band plan are correct as you quoted (assuming 1840, 
3600, and 7050 are the band limits in your region).

Some people may argue their voice signal is only 2.5 KHz wide, but the 
principle still holds the same.

73 de Bob - KØRC in MN

On 10/3/2012 8:22 AM, Tõnno Vähk wrote:
> There is one thing has been bothering me for a while and I am sure there
> are some knowledgable people here who can explain this.
> ITU R1 band plan says:
> * - Lowest dial setting for LSB Voice mode: 1843, 3603 and 7053 kHz*
> But it does not mention the highest dial setting for USB on 20-10 meters.
> So is it allowed to work USB on 14349 what concerns the band plan?
> IARU Region 1 and Region 2 band plans both also say:
> *Transmitting frequencies: The announced frequencies in the band plan are
> understood as “transmitted frequencies” and not those of the suppressed
> carrier!*
> What does it mean? Does it mean that furthermore, it is stressed that 14349
> is OK as it is the transmitted frequency?
> 73
> Tonno
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